Isolation Monitoring

Definition

Continuous measurement of electrical resistance between high-voltage conductors and chassis ground to detect insulation faults before they become hazardous.

Why It Matters

  • Detects insulation degradation before it causes shock hazard
  • Required for high-voltage systems in many safety standards
  • Prevents ground fault currents that can cause fires
  • Provides early warning of moisture ingress or insulation damage

Common Pitfalls

  • Not setting appropriate isolation resistance thresholds (typical: >100Ω/V)
  • Ignoring Y-capacitor effects on isolation measurement
  • Not considering altitude effects on isolation requirements
  • Failing to test isolation monitoring functionality regularly

Related Terms

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